Harvey Two-Face Dent is a fictional supervillain appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman. The character was created by Bob Kane and Bill Finger, and first appeared in Detective Comics #66 (Aug. 1942).
reactivity. 1  the quality or condition of being reactive. 2  Chemistry. the relative capacity of an atom, molecule, or radical to undergo a chemical reaction with another atom, molecule, or compound. 3  Physics. a measure of the deviation from the condition at which a nuclear reactor is critical.
Meaning: A chemical substance that is present at the start of a chemical reaction. Classified under: Nouns denoting substances. Hypernyms (reactant is a kind of...): chemical; chemical substance (produced by or used in a reaction involving changes in atoms or molecules) Learn English with...